`*`Linux is not actually required; Windows and Mac versions have been used. They are not supported.

`**`matplotlib is only required for plotting

`***`basemap is used only if available to add geopolitical boundaries to lat-lon plots.

### Prerequisites via EPD (Mac OS X/Linux/Unix/Windows)

This is the easiest way to get going. All of these prerequisites are available via the <a href="http://www.enthought.com/products/epd.php">Enthought Python Distribution</a> (EPD). Download their installer and run it. It's that easy. EPD is free for academics, but the edX version is not sufficient (unless combined with virtualenv instructions below).

### Prerequisites via virtualenv on Linux/Unix/Mac OS X

If you have a working version of Python 2.7 (or you can get edX from EPD for free) but you don't have root access to install, then I recommend you use <a href="https://pypi.python.org/pypi/virtualenv">virtualenv</a> by downloading <a href="https://raw.github.com/pypa/virtualenv/master/virtualenv.py">virtualenv.py</a>. The commands below setting up virtualenv and installing prerequisites:

5. This example would produce two Ox figures. Both from time 1 (default), but the first file from layer 1 and the second file from layer 2. The first figure has a minimum (max) value of 20 (60) and the second has a minimum (maximum) of 25 (65).